"It was bad," Sheen said, summing up the clash, "and I own my part in that and I just want to make everything right."

Asked why he thought he should have been fired, Sheen explained: "I should have been a little more responsible about the condition I was showing up in."

He told Leno he had not had any contact with his former castmates, but said he felt no animosity towards them. His formerly strained relationship with his father, actor Martin Sheen, was "totally repaired", he said, adding: "We're buddies again."

On Monday, Two And A Half Men returns for a new season with Kutcher replacing Sheen.

Sheen praised Kutcher as being "accomplished", and when asked if he had any advice for his successor, he said he would like to give him a hug and tell him: "Make me proud, dude."